Letters of the Third Crusade:

To protect his own interest from the crusaders, the Grecian emperor made an alliance with Saladin. This made the former a greater object of hatred than ever before. In the first crusade, Alexius had been suspected and detested ; Manuel had been openly blamed for the failure of the second crusade. Now in the third, no means are too odious to be attributed to the emperor of the East. In a few years, the hatred accumulated for more than a century will vent itself in the sack of Constantinople.